# [Day 3](https://adventofcode.com/2022/day/3) 
:gift::gift::gift:

Today's language: **C**

Extra: Task 1 in **vimscript**, generated by OpenAI with just a few fixes by myself

All the characters (the Elf's items) occuring in (half) a line (backpack) are stored as bits in an unsigned long, duplicate characters can then be determined by bitwise and-ing these numbers.
```shell
# Find the item type that appears in both compartments of each rucksack. What is the sum of the priorities of those item types?
gcc main.c -o day3
./day3

# OpenAI vim script
vim rucksack_items.txt
# in vim:
# :source day3-1.vim
```